KR19980048891A - Iron Sulfide Removal Device in Seawater - Google Patents

Abstract

An apparatus for removing iron sulfide contaminants generated in seawater due to landfilling and the like is provided.

The apparatus is characterized in that it detects sulfur components in seawater, control means for determining whether to inject air and hydrogen peroxide according to the detected concentration of sulfur components, and control means connected to the control means, using the air and hydrogen peroxide injected into the seawater to It is composed of a reactor which is oxidized and has a plurality of seawater through-holes formed therein, and an air aerator which is mounted inside the reactor to aeration air and a hydrogen peroxide distributor which discharges to hydrogen peroxide. And a chemical treatment device for oxidizing and removing iron sulfide in seawater.

Iron sulphide generated in seawater can be rapidly oxidized by installing at the point where suspected or confirmed iron sulfide generation in seawater.

Description

Iron Sulfide Removal Device in Seawater

The present invention relates to an apparatus for removing iron sulfide contained in seawater, and more particularly, to an apparatus for oxidizing and removing iron sulfide (FeS) produced by biological or chemical action in seawater.

In recent years, marine pollution problems have reached a serious level in the world. Especially, the seawater pollution on the coast is not only economically damaging to the fishermen around the coast, but also has a serious impact on the entire marine ecosystem. Is urgent.

One of the causes of sea pollution on the coast is iron sulphide, which is likely to occur in large-scale landfill projects for coastal industrial and agricultural land security. Iron sulfide seawater pollution produces iron sulfide by the biological action of bacteria or chemical reaction of the contained components when the rock or artificial stone containing sulfur compound and iron is thrown into the seabed.

The cause of the iron sulfide, which is one of the sea pollutants, will be described in more detail as follows.

In general, there is a liquid substance called interstitial water or interstitial water in the intergranular gap of coastal sediments or landfill inner layers. When the pore water is buried with the sediment, its chemical composition changes. This change is mainly known as the result of the decomposition of organics by bacteria. Table 1 below shows the standard free energy change when this action occurs by bacteria.

TABLE 1

Standard Free Energy Variation of Oxidation Reactions Caused by Bacteria

The decomposition of organic matter by bacteria is an oxidation process of organic matter, when oxygen is abundant, oxygen is used as an oxidant, but when oxygen is consumed and used, another chemical species is used as an oxidant. In the coastal sedimentary environment where organic matter is relatively actively supplied, when anoxic environment is well formed, sulfate (SO ₄ ^2- ) containing about 2000-3000 ppm in seawater is used for bacteria as oxidant instead of oxygen. Reduced to sulfides having a bivalent oxidation number.

Sulfide in seawater is the same thing when dumping natural or artificial stones containing sulfur as well as bacteria.

In addition, the sulfide generated in the ocean is in the gaseous phase or dissolved hydrogen sulfide (H ₂ S) depending on the pH, temperature, redox conditions, etc. This sulfur compound is dumped into the ocean by iron or rock containing iron If present, it reacts with iron to produce iron sulfide. In particular, since hydrogen solubility varies according to temperature as shown in Table 2, iron sulfide may be severely generated seasonally in some regions.

TABLE 2

Relationship between temperature of H ₂ S and Henry constant H

The detailed mechanism by which iron sulfide is produced and oxidized in the ocean is very complex, but can be expressed as follows.

Fe ²⁺ + S ^2- → FeS

^{Fe 2+ + HS - → FeS +} H +

3FeS + S ⁰ → Fe ₃ S ₄

2FeOOH + FeS + 4H ⁺ → 2Fe ²⁺ + S ⁰ + 4H ₂ o

^{FeOOH + 3 / 2HS - + 1} / 16S 8 0 + 3 / 2H + → FeS 2 + 2H 2 O

FeS + S ⁰ → FeS ₂

Fe ₃ S ₄ + 2 S ⁰ → 3FeS ₂

H ₂ S + FeS + oxidizing agent → FeS ₂ + H ⁺ + SO ₄ ^2-

Iron sulfide produced in the above reaction is transformed into various forms by sulfides or oxides in water. However, when such a reaction proceeds, the water quality of the seawater becomes black, and the smell of rotting eggs by hydrogen sulfide (H ₂ S).

Iron sulfide produced in the ocean by the reaction as described above is known to change the color of the sea water not only aesthetically good, but also adversely affect the growth of marine microorganisms. However, there has been no suggestion on how to detect and remove such seawater pollution by iron sulfide.

It is an object of the present invention to provide an apparatus for removing iron sulfide contained in seawater.

1 shows a schematic arrangement of a device according to the invention.

2 is a schematic perspective view of a reactor constituting the removal device according to the present invention.

FIG. 3 is a schematic perspective view of a chemical treatment apparatus mounted inside the reactor of FIG.

4 is a graph showing the absorbance scanning results of synthetic turbidity and seawater used in the examples of the present invention.

* Description of the symbols for the main parts of the drawings *

1: air and H ₂ O ₂ injection amount control means 2: connection means

3: reactor 4: air injection pipe

5: hydrogen peroxide injection pipe 6: connecting line

7,11 seawater passing through 8: chemical treatment device

9: Hydrogen oxide discharger 10: Air detonator

12: sulfur component detector

According to the present invention, detection means for detecting a sulfur component in seawater; Control means for controlling the injection amount of air and hydrogen peroxide when the sulfur component detecting means detects a sulfur component; A reactor which is connected to the control means and oxidizes iron sulfide in seawater by air and hydrogen peroxide injected through an air injection pipe and a hydrogen peroxide injection pipe, and a plurality of sea water passages are formed; And an air aerator connected to the air inlet tube and a hydrogen peroxide distributor connected to the hydrogen peroxide inlet tube, and a plurality of seawater introduced through the seawater through-holes of the reactor to pass therethrough. A chemical treatment device having sea water passages; Provided is an iron sulfide removal device contained in seawater comprising a.

An example of an iron sulfide removal device according to the present invention will be described with reference to the accompanying drawings.

1 is a schematic view of a schematic arrangement of a device according to the present invention, in which a reactor 3 for directly oxidizing iron sulfide in seawater in direct contact with seawater is installed inside a lake or a dike, and the reactor 3 is injected with air. It is connected to the outside air and the H ₂ O ₂ injection amount control device 1 by a connecting means 2 composed of a pipe 4, a hydrogen peroxide injection pipe 5, and a connecting line 6 connected to the sulfur component detecting means.

The control device 1 controls the injection amount of air and hydrogen peroxide according to the concentration of sulfur component detected by the sulfur component detecting means (not shown) to supply air and hydrogen peroxide from the air generator and hydrogen peroxide storage tank (not shown), respectively. have.

2 is a perspective view schematically showing the reactor 3 of the apparatus of the present invention, in which a plurality of seawater passing holes 7 through which seawater can pass freely are formed, and inside the control apparatus 1, respectively. Chemical processing apparatus (8) consisting of an air aerator (10) and a hydrogen peroxide distributor (9) which are configured to discharge air and hydrogen peroxide introduced through an air injection pipe (4) and a hydrogen peroxide injection pipe (5) connected thereto, respectively It is built.

The air detonator 10 and the hydrogen peroxide distributor 9 constituting the chemical treatment apparatus 8 have a plurality of seawater passing holes 11 through which seawater introduced through the seawater passing holes 7 of the reactor can pass. Formed.

On the other hand, reference numeral 12 denotes a sensor as a detection means for detecting sulfur components in seawater, and the sensor 12 is connected to the control device 1 by a connecting line 6.

The apparatus of the present invention configured as described above first detects the occurrence of iron sulfide pollutants as the color and smell of seawater using visual and smell, and determines that the iron sulfide pollutant is generated. After the contaminant is identified as iron sulfide by the method, it is installed and used in the iron sulfide contamination area.

If the apparatus of the present invention is installed in the region where the iron sulfide contamination is confirmed, the sulfur component detecting means 12 connected to the control device 1 detects the sulfur component (in this case, the sulfur component is iron sulfide in advance) and the concentration It is transmitted to the control device 1 through the connecting line (6).

The control device 1 receiving the detection of sulfur and its concentration from the detection means 12 calculates the amount of air and hydrogen peroxide required for the oxidation treatment of sulfur, and then supplies air and hydrogen peroxide from an air generator and a hydrogen peroxide reservoir not shown, respectively. Through the air injection pipe 4 and the hydrogen peroxide injection pipe 5 is sent to the air initiator 10 and the hydrogen peroxide distributor 9 mounted in the reactor (3).

Meanwhile, black turbid water contaminated with iron sulfide is introduced into the seawater through-holes 7 and 11 of the reactor 3 and the chemical treatment apparatus 8 together with the seawater, and the introduced turbid water is the air detonator 10. ) And the hydrogen peroxide discharged from the hydrogen peroxide distributor 9, and the iron sulfide in the turbid water is oxidized and removed.

The air detonator 10 and the hydrogen peroxide distributor 9 are structured to smoothly react with turbid water by dispersing evenly supplied air and hydrogen peroxide.

When the apparatus of the present invention is installed at the point where turbid water generation (iron sulfide generation) is confirmed in the embankment as described above, the iron sulfide compound is introduced into the reactor, and the air and hydrogen peroxide are properly distributed by the operation of the sulfur component detecting means, thereby shortening the iron sulfide for a short time. It will be removed by oxidation (2-4 minutes).

In the oxidation reaction, H ₂ S, which is a source of FeS generation, is oxidized by air (oxygen contained in air) and hydrogen peroxide (H ₂ O ₂ ) to form S ₂ O ₃ ^2- , SO ₄ ^2-, and iron oxide (Fe ₂ O). ₃ ) are thought to produce harmless ones.

According to the present invention, it is possible to prevent marine pollution by efficiently oxidizing iron sulfide (FeS) generated in seawater due to landfill and the like using air and hydrogen peroxide.

Claims (1)

Detection means (12) for detecting sulfur components in seawater; An air and H ₂ O ₂ injection amount control device (1) for controlling the injection amount of air and hydrogen peroxide when the sulfur component is detected by the detection means (12); Is connected by the control means and the connecting means (2) consisting of the air injection pipe (4), hydrogen peroxide injection pipe (5) and the connecting pipe (6), the air injection pipe (4) and hydrogen peroxide injection pipe (5) A reactor (3) for oxidizing iron sulfide in seawater by air and hydrogen peroxide injected therethrough, wherein a plurality of seawater passage holes are formed; And an air aerator 10 mounted inside the reactor and connected to the air injection pipe 4, and a hydrogen peroxide distributor 9 connected to the hydrogen peroxide injection pipe 5. Iron sulfide removal device in the seawater comprising a; chemical treatment device (8) having a plurality of seawater passage hole (11) formed to pass through the seawater introduced through the seawater passage hole (7).